Close coupled cistern toilet seat posts loose_any suggestions valued

My toilet seat (retaining) posts have become loose, but being close coupled
cistern, have no access to what I presume are some form of plastic wing nuts
underneath.
I gather you can now get top loading fixing sets for loo seats, so would like to
fit those after I get current posts out, so I can use the cistern holes.
eg http://www.limekitchenandbathroom.co.uk/PRD_ProductDetail.aspx?prodidV07
Anyone any suggestions as to either how as short term fix, make posts tighter,
with no access underneath?
They became loose when prying seat off the 2 posts.
2nd option would be to get out/ break off, but without damaging porcelain, or
having to remove whole cistern unit, which may damage floor tiles?
Thanks

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